Timothy H. Chao, MD, PhD
Pathology and Laboratory Medicine
Accepting new patients
Sees patients age 18 and up
Penn Pathology and Laboratory Medicine HUP
Penn Medicine Provider

About me

  • Assistant Professor of Clinical Pathology and Laboratory Medicine

Education and training

  • Medical School: University of Pennsylvania Health System
  • Residency: Thomas Jefferson University Hospital
  • Fellowship: Hospital of the University of Pennsylvania

Insurance accepted

My Locations

Penn Medicine hospital privileges

  • Hospital of the University of Pennsylvania: Has privileges to treat patients in the hospital.
  • Pennsylvania Hospital: Has privileges to treat patients in the hospital.
  • Penn Presbyterian Medical Center: Has privileges to treat patients in the hospital.
Dr. Chao is a Penn Medicine physician.

Qualifications and experience

Treatments and Conditions

My research

Nova-Camacho LM, Ma C, Abukhiran I, Shaker N, Abdul Baki MN, Collins K, González I, Chao T, Yang Z, Vyas M, Feely M, Bellizzi AM, Agostini-Vulaj D, Huber AR, Polydorides AD, Xu X, La Rosa S, Paricio JJ, Uccella S, Alvarez ML, Ordoñez Arrillaga A, Ruiz Diaz I, Karamchandani DM, Luchini C, Verdú Martin E, Zudaire Fuertes T, Rubio Mediavilla S, Xiong W, Cox B, Gonzalez RS. Composite gangliocytoma/neuroma and neuroendocrine tumour: a contemporary analysis of 71 cases shows risk factors for metastasis , Histopathology: 2025


Tapescu I, Kohler A, Sangal NR, Brant JA, Brody RM, Chao T, Carey RM. Thyroid Malignancies With Thymic Differentiation: Outcomes of Rare SETTLE and CASTLE Tumors , Head Neck: 2025


Pearlstein H, Chao T, He Z, Molle-Rios Z. Mast cells and corticotropin-releasing hormone receptors in duodenal tissue of children with functional dyspepsia , J Pediatr Gastroenterol Nutr: 2025


Chao T, Wang ZX, Bowne WB, Yudkoff CJ, Torjani A, Swaminathan V, Kavanagh TR, Roadarmel A, Sholevar CJ, Cannaday S, Krampitz G, Zhan T, Gorgov E, Nevler A, Lavu H, Yeo CJ, Peiper SC, Jiang W. Association of Mutant KRAS Alleles With Morphology and Clinical Outcomes in Pancreatic Ductal Adenocarcinoma , Arch Pathol Lab Med, 148: 2024,1299-1309


Meredith L, Chao T, Nevler A, Basu Mallick A, Singla RK, McCue PA, Bowne WB, Jiang W. A rare metastatic mesenteric malignant PEComa with TSC2 mutation treated with palliative surgical resection and nab-sirolimus: a case report , Diagnostic Pathology, 18(1): 2023,45


M.D. Gonzalez, T. Chao, M.A. Pettengill Modern Blood Culture: Management Decisions and Method Options , Clinics in Laboratory Medicine, 40(4): 2020,379-392


M.E. Smith, S.J. Farahani, T. Chao, M. Palmer, A. Arriola, P. Lal PD-L1 positivity associated with presence of tertiary lymphoid structures and high-stage disease in upper tract urothelail carcinoma , American Journal of Clinical Pathology, 154(6): 2020,802-810


K. Hafazalla, D.Y. Ye, T. Chao, M. Curtis, C.J. Farrell Subependymal giant cell astrocytoma without clinically or genetically identifiable tuberous sclerosis complex: a case report. , Case Reports and Series in Surgery, 1(2): 2020,1-4


J. Li, K.T. Byrne, F. Yan, T. Yamazoe, Z. Chen, T. Baslan, L.P. Richman, J.H. Lin, Y.H. Sun, A.J. Rech, D. Balli, C.A. Hay, Y. Sela, A.J. Merrell, S.M. Liudahl, N. Gordon, R.J. Norgard, S. Yuan, S. Yu, T. Chao, S. Ye, TS.K. Eisinger-Mathason, R.B. Faryabi, J.W. Tobias, S.W. Lowe, L.M. Coussens, E.J. Wherry, R.H. Vonderheide, B.Z. Stanger Tumor cell-intrinsic factors underlie heterogeneity of immune cell infiltration and response to immunotherapy. , Immunity, 49(1): 2018,178-193.e7.


V. Kumar, L. Donthireddy, D. Marvel, T. Condamine, F. Wang, S. Lavilla-Alonso, A. Hashimoto, P. Vonteddu, R. Behera, M.A. Goins, C. Mulligan, B. Nam, N. Hockstein, F. Denstman, S. Shakamuri, D.W. Speicher, A.T. Weeraratna, T. Chao, R.H. Vonderheide, L.R. Languino, P. Ordentlich, Q. Liu, X. Xu, A. Lo, E. Pure, C. Zhang, A. Loboda, M.A. Sepulveda, L.A. Snyder, D.I. Gabrilovich. Cancer-associated fibroblasts neutralize the anti-tumor effect of CSF1 receptor blockade by inducing PMN-MDSC infiltration of tumors , Cancer Cell, 32(5): 2017,654-668